ophthalmoleukoscope
noun
oph·thal·mo·leu·ko·scope
variants
or less commonly ophthalmoleucoscope
(ˌ)äfˌthalməˈlükəˌskōp,
÷(ˌ)äpˌth-
: an apparatus for testing the color sense by means of colors produced by polarized light
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Merriam-Webster unabridged
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